Method and system for item authentication and customization

ABSTRACT

A method of illumating an item is disclosed. The method includes applying adhesive to the item, interspersing a taggant in the adhesive, illuminating the item with an excitation signal, sensing luminescence emitted by the taggant in response to illumination by the excitation signal, and determining the authenticity of the item based on the sensed emitted luminescence. The item can include any item benefited by authentication, and can include a postage stamp. A method of customizing an item is disclosed. This can include the steps of preparing a substrate, applying a security feature to the substrate, printing non-customized information on the substrate, receiving image information, and printing the image information on the substrate.

INCORPORATION BY REFERENCE TO ANY PRIORITY APPLICATIONS

This application is a divisional of U.S. application Ser. No.15/065,749, filed Mar. 9, 2016, entitled “Method and System for ItemAuthentication and Customization,” which is a continuation of U.S.application Ser. No. 13/790,559, filed Mar. 8, 2013, entitled “Methodand System for Item Authentication and Customization,” which in turnclaims the benefit of U.S. Provisional Application No. 61/609,163, filedMar. 9, 2012, entitled “Item Authentication and Customization Process,”the entire contents of which are hereby incorporated by reference. Anyand all applications for which a foreign or domestic priority claim isidentified in the Application Data Sheet as filed with the presentapplication are hereby incorporated by reference under 37 CFR 1.57.

BACKGROUND

Field of the Development

This application relates generally to custom systems and methods forauthenticating articles.

Description of the Related Technology

Counterfeiting articles of many kinds is a serious problem worldwide,causing great loss of revenues to legitimate businesses and toindividuals. Counterfeiters have produced articles that are verydifficult to distinguish from the genuine articles, taking salesrevenues from the producers of genuine articles and impacting legitimatebusiness' reputations when the counterfeit articles have inferiorquality and/or non-existent manufacturers' support. Similarly, problemsand losses occur due to counterfeiting of articles used for financialtransactions or identification, such as postage stamps, banknotes,credit cards, drivers' licenses, passports, and immigration documents.Even when genuine articles have been marked with authentication markingssuch as watermarks, special papers, and holograms which are difficult toreplicate, counterfeiters have managed to produce articles that appeargenuine. The general availability of newer replication technology suchas high-resolution image scanners, laser copiers and printers, andcolor-accurate color copiers and printers has enabled counterfeiters toproduce more credible counterfeit articles.

Postage stamps have historically been produced by governing entities.Their intended purpose is to show that a certain fee has been paid topost a mail piece for delivery. Very shortly after the innovation of thepostage stamp, some people began to counterfeit stamps and some peoplebegan to save and collect stamps.

These technological developments of replication hardware continue toprogress rapidly, as does the development of computer hardware andsoftware that support them. Thus it is useful to have additional ways tomark articles for authentication with greater security. Greater securitymay be achieved by making authentication markings more difficult forcounterfeiters to detect and interpret, by incorporating greatercomplexity into the markings, and by making replication bycounterfeiters more difficult. Combining multiple kinds of markingindicia can further increase the complexity of detection,interpretation, and replication, thus providing even better security.Considering the security issue from another point of view, it is notdesirable to use the same means that generated the visible appearance ofan article to authenticate it, as the visible appearance is becomingeasier to replicate.

Many methods have been known to authenticate valuable articles. Someknown methods include imprinting a white-light hologram on an item forauthentication or imprinting reflective and diffractive indicia whichdisplay distinctive images that are difficult to counterfeit on an itemfor authentication. Other known methods include incorporation ofdistinctive fibers into the articles, such fibers being detectable byvisual observation, microwave irradiation, or other means.

Thus, a covert optical feature with ability to be detected viaelectronic authentication apparatus and that cannot be reproduced bycommon visible graphic copying and printing means can provide improvedsecurity is described herein.

Stamp collecting has likewise affected postal business. Specifically,stamp collecting encouraged stamp issuing entities to produce stampswhich not only function as a proof of payment device, but which are alsotopically and/or aesthetically appealing. Traditionally subjects ofbroad appeal such as landmarks, indigenous plants and animals, andnationally known public figures have been featured on postage stamps. Inthe 21st century, with the advent of new technology, the capabilityexists to economically produce small quantities of postage stamps whichappeal to a narrower audience. This has sparked the emergence of“personalized postage stamps.”

Personalized postage is currently available in the United States andother countries. Private companies have contract agreements with theUSPS to create postage stamps using customer submitted images and text.However, these stamps require a large portion of the face of the stampbe utilized for scrambled indicia to ensure compatibility with USPSautomation equipment. These large indicia reduce the available imagesize, and detract from the overall aesthetic appeal. Some postalagencies in other countries produce personalized postage stamps, buttheir design utilizes a perforation between the actual valid postage andthe personalized segment of the stamp. If the two parts are separated onthe perforation, the personalized design is simply a sticker with nopostage value.

SUMMARY

Some embodiments relate to a method of authenticating an item. In someembodiments, the method of authenticating an item can include, forexample, applying an adhesive to the item, interspersing a taggant inthe adhesive, which taggant can emit luminescence in response to anexcitation signal, illuminating the item with the excitation signal,sensing the emitted luminescence from the taggant, and determining theauthenticity of the item based on the sensed emitted luminescence.

In some aspects of the method of authenticating an item, the excitationsignal can be electromagnetic energy which can be energy within apredetermined spectrum. In some aspects, the electromagnetic energy canbe IR and/or UV.

In some aspects of the method of authenticating an item, the emittedluminescence can be electromagnetic energy which can be energy within apredetermined spectrum. In some aspects, the emitted luminescence can beIR and/or UV. In some aspects of the method of authenticating the item,both the excitation signal and the emitted luminescence are IR.

Some embodiments relate to a method of authenticating an item through asubstrate. In some embodiments, the method of authenticating an itemthrough a substrate can include, for example, applying a taggant to theitem, which taggant can, for example, emit luminescence in response toillumination by an excitation signal, illuminating a substrate with anexcitation signal. In some embodiments, the properties of the excitationsignal allow the excitation signal to pass through the substrate toexcite luminescence by the taggant. In some embodiments, the method ofauthenticating an item through a substrate can include sensing emittedluminescence and determining the authenticity of the item based on thesensed luminescence. In some embodiments, the properties of the emittedluminescence allow the emitted luminescence to pass through thesubstrate to be sensed.

In some aspects of the method of authenticating an item through asubstrate, the relative transparency of the substrate is determinedacross a portion of the electromagnetic spectrum. In some aspects of themethod of authenticating an item through a substrate, the taggant isexcited by the excitation signal having a wavelength corresponding tohigh relative transparency of the substrate, and/or the taggant emitsluminescence having a wavelength corresponding to a high relativetransparency of the substrate in response to illumination by theexcitation signal.

In some aspects of the method of authenticating an item through asubstrate, the excitation signal can be electromagnetic energy which canbe energy within a predetermined spectrum. In some aspects of the methodof authenticating an item through a substrate, the excitation signal canbe IR and/or UV.

In some aspects of the method of authenticating an item through asubstrate, the emitted luminescence can be electromagnetic energy whichcan be energy within a predetermined spectrum. In some aspects of themethod of authenticating an item through a substrate, the emittedluminescence can be IR and/or UV. In some aspects of the method ofauthenticating an item through a substrate, both the excitation signaland the emitted luminescence can be IR.

Some embodiments relate to a method of creating customized postagestamps. In some embodiments, the postage stamps can include a substrate,adhesive and a printing, and the method can include preparing thesubstrate, applying a security feature to the postage stamps, printingnon-customized information onto the substrate, which non-customizedinformation can include an indication of stamp value and a stampcharacteristic, receiving image information, and printing the imageinformation onto the substrate.

In some aspects of the method of creating customized postage stamps,preparing the substrate includes receiving a sheet of stamp paper,applying an adhesive to the substrate, and/or dividing the substrateinto postage stamp sized pieces. In some aspects of the method ofcreating customized postage stamps, the substrate is divided intopostage stamp sized pieces via perforations.

In some aspects of the method of creating customized postage stamps,applying the security feature comprises printing a security feature ontothe substrate, integrating a feature into the substrate, and/or adding ataggant to the substrate.

In some aspects, the method of creating customized postage stamps canfurther include determining if the received image information meetsimage information requirements, and/or resizing the image information tofit on a customized postage stamp. In some aspects of the method ofcreating customized postage stamps the printing of the non-customizedinformation and the printing of the image information are simultaneousor the printing of the non-customized information and the printing ofthe image information are temporally spaced.

Some embodiments relate to a system for authenticating an item. In someembodiments the system can include, for example, a label or identifierthat can include a substrate, adhesive applied to a portion of thesubstrate, and a taggant interspersed in the adhesive. In someembodiments, the system can include a detector that can include anilluminator that emits a signal that excites the taggant to luminesce,and a sensor that detects luminescence emitted by the taggant.

In some aspects of the system, the item can further include a printing.In some aspects of the system, the substrate is substantially planar andcomprises a first side parallel to a second side. In some aspects of thesystem, the adhesive is, for example, applied to the first side of thesubstrate, and/or the printing is, for example, applied to the secondside of the substrate. In some aspects of the system, the adhesiveaffixes the item to an object.

In some aspects of the system, the signal emitted by the illuminatorpasses through the substrate before it excites the taggant to luminesce,and/or the luminescence emitted by the taggant passes through thesubstrate before it is detected by the sensor.

Some embodiments relate to a method of authenticating an item. In someembodiments, the method can include, for example, illuminating the itemwith the excitation signal. In some embodiments, the item can include anadhesive with an interspersed taggant that emits luminescence inresponse to an excitation signal. In some embodiments, the methodfurther includes, sensing the emitted luminescence from the taggant anddetermining the authenticity of the item based on the sensed emittedluminescence.

Some embodiments relate to a method of authenticating an item through asubstrate. In some embodiments, the method includes illuminating asubstrate with an excitation signal. The substrate can include, forexample, a taggant that emits luminescence in response to illuminationby an excitation signal. In some embodiments of the method, theexcitation signal passes through the substrate to excite luminescence bythe taggant. In some embodiments, the method further includes, sensingemitted luminescence, which luminescence can pass through the substrateto be sensed. In some embodiments, the method further includesdetermining the authenticity of the item based on the sensedluminescence.

The foregoing is a summary and thus contains, by necessity,simplifications, generalization, and omissions of detail; consequently,those skilled in the art will appreciate that the summary isillustrative only and is not intended to be in any way limiting. Otheraspects, features, and advantages of the devices and/or processes and/orother subject matter described herein will become apparent in theteachings set forth herein. The summary is provided to introduce aselection of concepts in a simplified form that are further describedbelow in the Detailed Description. This summary is not intended toidentify key features or essential features of the claimed subjectmatter, nor is it intended to be used as an aid in determining the scopeof the claimed subject matter.

DESCRIPTION OF THE DRAWINGS

FIG. 1A illustrates one embodiment of a basic mechanism of an itemvalidation system, showing the pathway of an excitation light as ittravels through the print and the substrate to the luminescent additiveeliciting the luminescent response that radiates back through thesubstrate.

FIG. 1B illustrates one embodiment of an item validation system havingmore than one type of taggant.

FIG. 1C illustrates one embodiment of an item validation system havingspecific adhesive areas with taggants.

FIG. 1D illustrates an embodiment of an item validation system havingembedded portions in a substrate which block a signal emitted from thetaggant.

FIG. 2 illustrates an embodiment of a detector for use in itemvalidation.

FIG. 3 shows one embodiment of an authentication system comprising adetector and an object.

FIG. 4 is a flow-chart illustrating an embodiment of a process forauthenticating an item via luminescent taggants.

FIG. 5 shows variation in the transparency of a substrate for light ofdifferent wavelengths.

FIG. 6 shows the optical pigment BL24 emitting luminescence in a seriesof narrow spectral peaks around 800 nm while subjected to excitation at950 nm.

FIG. 7 illustrates one embodiment of a label having a first and a secondinformation area.

FIG. 8 is a flow-chart illustrating an embodiment of a process of makinga label.

FIG. 9 is a flow-chart illustrating an embodiment of a process ofperforming the primary printing.

FIG. 10 is a flow-chart illustrating an embodiment of a process ofreceiving the image information and performing the secondary printing.

Various features illustrated in the drawings may not be drawn to scale.Accordingly, the dimensions of the various features may be arbitrarilyexpanded or reduced for clarity. In addition, some of the drawings maynot depict all of the components of a given system, method or device.Finally, like reference numerals may be used to denote like featuresthroughout the specification and figures.

DETAILED DESCRIPTION

The features, aspects and advantages of the present development will nowbe described with reference to the drawings of several embodiments whichare intended to be within the scope of the embodiments herein disclosed.These and other embodiments will become readily apparent to thoseskilled in the art from the following detailed description of theembodiments having reference to the attached figures, the developmentnot being limited to any particular embodiment(s) herein disclosed.

The system described herein provides an improved authentication systemthat stimulates, detects and recognizes a response from an indicator inan item to be validated or authenticated. In some embodiments, thesystem described herein provides an improved authentication system thatstimulates, detects, and recognizes infrared (“IW”) response from anindicator in an item to be validated or authenticated. In someembodiments, the system described herein provides an improvedauthentication system that stimulates, detects, and recognizes IRresponse from a luminescent adhesive incorporated into the item that isto be validated or authenticated. This IR response can be, in someembodiments, stimulated, detected, and recognized through the substrateof an item to be validated or authenticated.

In one embodiment, the system combines the use of compounds that produceluminescence when being subjected to illumination in a designatedspectrum with detectors that are capable of detecting the luminescentresponse and then analyze the response's optical signature. In someembodiments, the compounds can luminesce in a designated portion of theelectromagnetic spectrum in response to illumination with infrared,visible, or ultraviolet. In some embodiments, the luminescence of thecompounds can be in the same spectral regions as the illumination, andin some embodiments, the luminescence of the compounds can be indifferent spectral regions than the illumination. In one specificembodiment, the compounds are illuminated with IR and likewise luminescein IR.

The system can comprise two components: 1) a unique optical taggantmaterial embedded into one or several components of the item to beauthenticated, and 2) a corresponding detector to authenticate thepresence of the embedded taggant.

Generally, a system and label are described herein whereby a taggant isintroduced into an adhesive or backing of a label. The label may be apostal stamp, tax stamp, product label or other substrate with adhesivewhich is used to impart a level of security or impart some information.In one embodiment, the item to be authenticated utilizes taggant in theadhesive. In another embodiment, the item to be authenticated utilizestaggant in the paper, ink, or other portion of the item. Advantageously,use of such a system can impart information to identify an item.Further, use of such a system can conceal the security features toinhibit replication of the security features. The detector may emit asignal, wavelength, or spectrum which will interact with the taggant.The detector signal may be referred to as an interrogation wavelength.Upon interaction with the interrogation signal, the taggant may respondby emitting a wavelength, signal, or spectrum, which may be referred toas the response wavelength. These concepts will be explained in moredetail below.

FIG. 1 depicts one embodiment of some aspects of an authenticationsystem 100. FIG. 1 depicts a label 150 comprising an adhesive 200, asubstrate 180, and printed material 190 on the outward facing surface ofthe substrate 180. As depicted in FIG. 1, the label 150 is adhered to anobject 170 by the adhesive 200. As further depicted in FIG. 1, the label150 comprises a taggant 300 interspersed in the adhesive 200 of thelabel 150. The discussion herein is directed toward a label adhered toan object. The label is an exemplary embodiment used for convenience. Aperson of skill in the art would understand that the article beingadhered to an object may be a postage stamp, a sticker, a poster, or anyother desired article. A skilled artisan will also understand that toeffectuate the authentication system or process the label need notnecessarily be adhered to a specific object, or any object. In someexemplary embodiments, the label 150 is a postage stamp, and the object170 is an envelope or other mail article, but the label 150 and theobject 170 are not limited thereto.

In some embodiments, the label 150 can comprise a variety of shapes andsizes and can be made of a variety of materials. In some embodiments,the label 150 can comprise paper, cloth, wood, metal, manmade, ornatural materials. In some embodiments, the label 150 can comprise anobject of a type that is frequently counterfeited or on which frequentcounterfeiting attempts are made. In some embodiments, the label 150 cancomprise any object for which authentication is desirable. In someembodiments, the label 150 can comprise an object whose representativevalue is higher than its inherent value; the label 150 can comprise anobject having more value than the sum of its material costs andmanufacturing costs. Such objects can include, for example, money,checks, postage, tickets, including airplane tickets, movie tickets,concert tickets, lift tickets, vouchers, or any other similar object. Inanother embodiment, the label 150 can comprise a protective marking onproduct packaging, tax stamps, pharmaceutical labels, or apparel andshoe labels. In another embodiment, the label 150 can comprise anidentification document such as a passport or immigration document, orany other similar document.

The substrate 180 can comprise a variety of shapes and sizes and can bemade of a variety of materials. In some embodiments, the substrate 180can comprise paper, cloth, wood, metal, manmade, or natural materials.The substrate 180 can comprise any material configured to receiveindicia of the label 150. In some embodiments, these indicia of the itemcan be printed, pressed, embossed, applied, dyed, or otherwise placed onor incorporated into the substrate 180. In one specific embodiment, thesubstrate 180 can comprise a piece of paper cut or delineated with, forexample, perforations for use as a stamp.

The adhesive 200 can comprise a variety of adhesive materials. In someembodiments, the adhesive 200 can comprise a natural or a manmadeadhesive. In some embodiments the adhesive 200 can be applied to all orportions of the substrate 180. In one embodiment, and as depicted inFIG. 1, the adhesive 200 covers one side of substrate 180. In oneembodiments, the adhesive 200 can comprise the adhesive material on theback of a stamp. Taggants

In some embodiments, the taggant 300 can comprise a luminescentmaterial, which can be configured to luminesce in response toillumination by an excitation signal. In some embodiments, thisexcitation signal can be created by a detector device. The excitationsignal can illuminate the taggant 300 and excite the luminescentmaterial. The luminescent material, now excited by the excitationsignal, luminesces, which luminescence can be detectable by the detectorto identify the label 150. In some embodiments, the luminescent materialcan be configured to luminesce for the duration of its illumination bythe excitation signal. In some embodiments, the detector can positivelyidentify the label 150 if the detector detects luminescence orluminescence of a specific wavelength in response to illumination by theexcitation signal.

In some embodiments, the taggant 300 may be a phosphorescent taggant.The optical properties may vary for the taggant. For increased securitythe taggant is preferably phased, meaning the interrogation wavelengthis different from the response wavelength. In fluorescent taggants theinterrogation wavelength can be higher than the response or fluorescentwavelength. The taggant can be tailored for shift of wavelength betweenthe interrogation wavelength and response wavelength and the responsetiming or delay of response. Alternatively, the taggant may use a dualphase shift. Meaning the taggant has the ability to have oneinterrogation wavelength with a shift to X wavelength and anotherinterrogation wavelength with a shift to Y wavelength for response. Inthis way a broad spectrum interrogation may be used but only one of theshifted wavelengths is scanned for response.

In some embodiments, one or more taggants 300 may be chosen so that theresponse wavelength matches the interrogation wavelength. In someembodiments, the difference or mismatch between the interrogation andthe response wavelength may be used to identify a genuine article orlabel.

In some embodiments, one or more taggants 300 may be selected based onthe intensity or strength of the response wavelength. The strength orintensity of the response wavelength maybe used to authenticate orverify genuine articles or labels. For example, a taggant 300 whichemits a high or strong response wavelength may be chosen to provide afirst response wavelength in combination with a taggant 300 which emitsa weaker second response wavelength, which masks the detection bandwavelength.

In some embodiments, the luminescent material may be configured tocontinue to luminesce for some duration of time after it has beenilluminated by the excitation signal. The duration of time that theluminescent material luminesces, and the change of intensity of theluminescence over time can be characterized by luminescent decay. Insome embodiments, the taggant 300 can comprise a luminescent materialhaving known luminescent decay. In such embodiments, the luminescentdecay of the luminescent material can be detected by the detector inresponse to an excitation signal of known intensity and duration and canbe used to identify the label 150.

The taggants 300 can comprise a variety of features, sizes, andmaterials. In one embodiment, the taggants 300 can comprise particles.These particles may have a dimension of approximately, 0.0001 mm, 0.0005mm, 0.001 mm, 0.005 mm, 0.01 mm, 0.05 mm, 0.1 mm, 0.5 mm, 1 mm, 10 mm,25 mm, or any other desired size. In some embodiments the taggants 300can comprise a variety materials, including, for example, natural ormanmade materials. In some embodiments, the taggants 300 can compriseceramics, and can specifically comprise inorganic optical ceramics. Insome embodiments, the taggants 300 can be configured to beenvironmentally stable, which can include, for example, thermalstability, chemical stability, or stability with regards to any otherdesired environmental factors such as, for example, humidity orpressure. In some embodiments, more than one type of taggant 300 may beused at a time. For example, the label 150 may comprise both an opticalceramic and an IR illuminated taggant, or one taggant 300 with aresponse wavelength in the visible spectrum and a second taggant 300having a response wavelength in the IR spectrum. These combinations areexemplary only, and are not intended to limit the scope of thisapplication.

In some embodiments, the taggant 300 may be an optical taggant. Apreferred taggant 300 is one that is stable in the adhesive. In someembodiments, a taggant 300 that deteriorates over a known time may beadvantageous. In some embodiments, the taggant 300 may produce aresponse wavelength having an upshift or a downshift from theinterrogation wavelength, and may have an interrogation wavelength orresponse wavelength in the UV, visible or IR spectrums. In a high volumeapplication such as with conveyor belts the interrogation wavelength ispreferably in the IR or UV spectrum, whereas high intensity visiblelight may damage the rubber or other organic components of a conveyorsystem.

Taggant 300 may be a variety of materials, such as organic dyes,pigments, metallic oxides, inorganic ceramics, or the like. In someembodiments, the taggant 300 may be quantum dots or the like which maybe tuned to varying frequencies. In one embodiment, the taggant 300 is ametallic oxide which tends to be stable for long periods and is easilyhandled. Rare earth oxides like lanthanum oxide and the like may havedesirable characteristics. Other metal oxides which are tunable tovarious frequencies may be employed and may be advantageously used dueto the tunability and ability to add choices to the strata and inks.

Advantageously, the use of environmentally stable taggants 300 can allowthe use of the taggants in difficult environments, and can increasemanufacturing flexibility relating to the time of application of thetaggants 300 in the manufacturing process, the location of the taggants300 in a manufactured item, and finishing process performed after theapplication of the taggants 300. Specifically, and in contrast to dyesor other identification techniques currently used, the use ofenvironmentally stable taggants 300 expands applicability of taggants300. Further, due to the physical features and attributes of thetaggants 300, the taggants 300 are very difficult to isolate, and arethus very difficult to reverse engineer. This provides an additionallayer of security as it further complicates the process of creatingcounterfeit taggants 300.

In one specific embodiment, taggants 300 comprising inorganic opticalceramics can be configured to operate in a specific region of the lightspectrum, such as, for example, the IR region, the visible light region,or the UV region. In some embodiments, the taggants 300 operate innon-visible portions of the light spectrum. A human eye may be used a asa detector in some applications where the response wavelength of thetaggant 300 is in the visible spectrum. For example, the taggant 300 mayglow in a desired color in the visible spectrum when interrogated withIR, visible or UV light, thus showing a user the label or strata withinthe label 150 are genuine. A detector would be needed in the case ofresponse wavelengths outside the visible spectrum.

In some embodiments, the taggants 300 can be uniquely identifiable, todetermine information such as manufacturing batch, approximate time ofmanufacture, or other information. In addition to the covertluminescence level of security, they carry a forensic (laboratory)level. In other embodiments, other taggants or fluorescents are used.

In some embodiments, the taggants 300 can comprise materials, sizes, andluminescent materials that are safe for use in a variety ofapplications. In some embodiments, the taggants 300 can be safe for usein food packaging and toys. In some embodiments, the taggants 300 can beconfigured for passing health and safety tests such as, for example, theEN71-3 and TPCH tests.

In some embodiments, the taggants 300 can be configured to be visible orinvisible to the human eye. In some embodiments, the taggants 300 cancomprise dimensions and materials that prevent detection by the humaneye. In some embodiments, the taggants 300 can be located on or in theadhesive 200 to prevent detection by the human eye. Thus, in oneembodiment, and as depicted in FIG. 1A, the taggants 300 can comprise anintegral portion of the label 150, and can thereby be invisible to thehuman eye. Advantageously, taggants 300 having properties or placementswhich prevent detection by the human eye can further decrease thelikelihood of duplication. Thus, in some embodiments, the taggants 300can be difficult to duplicate and hard to detect because they are out ofthe line of sight and are invisible to the naked eye, UV insensitive,and hard to separate from the adhesive 200. The taggant 300 possesses asecure technology in that it is stable thermally and chemically and ithas an immeasurable lifetime. In one embodiment, the ceramic is anon-reactive ceramic, withstanding temperatures up to 1000° C. Thetaggant is lightfast, non-hazardous and is easily integrated into theadhesive coating process.

In some embodiments, the taggant 300 may be used to incorporateinformational or other types of security. The shape of an image of thetaggant 300 may be screen printed or applied via a number of techniquessuch as ink-jet printing or the like. The applied taggant 300 can be inmany different shapes and sizes, for example, the taggant 300 may beshaped as a logo of a company, an image, a number, name of buyer orseller, or barcodes of various types, applied using a variety oftechniques described herein. One label may have several of these at thesame time and each may be in a different taggant or the same taggant.

When using an informational image such as a name or the like it may bepreferable for the image to be visible to the human eye. Thus theresponse wavelength of the taggant should be in the visible spectrumalthough the interrogation wavelength need not be. For information ormachine readable images it may be preferable but not necessary to havethe response wavelength in the non-visible spectrum like IR. Theseinformation images may be scanned by a device which is sensitive to theresponse wavelength or imaged with a scanner or camera (e.g., IR camera,visible light camera, SLR camera, etc.) for further processing to obtainthe image and information. A camera can take a picture of the responseand then enhance the image whereby the enhanced image is processed toobtain the barcode and information therefrom.

The label or strata within the label 150 may be mass produced by theseprocesses. In some embodiments, the taggant 300 or a substancecontaining the taggant 300 may be printed onto the back of a sheet orpaper, which is then covered with adhesive to combine the taggant withthe adhesive, or may be printed onto a label backing onto which anadhesive label is placed. In some embodiments, the taggant 300 orsubstance containing the taggant 300 may be printed onto a surface ofthe object to be covered by the label, and then covered by adhesive. Insome embodiments, where the taggant is applied to the label backing, thelabel is then at a later time the label is removed from the backing andplaced on the object. Even though originally printed on the backing, thetaggant 300 is combined with the adhesive and carried off with the labeland adhesive when the label is applied to the object. In mass productionthe image or information may remain the same or change with each labelor both. These methods may be performed either generally or locally, andmay impart an image to the label or the object onto which the label willbe placed. For example the logo of the manufacturer may be the same witheach label but the barcode or serial number may change for each label.Either of these images may use the same taggant or different taggant.

The label 150, which may be a label or several strata may be chosendepending on the interrogation and response wavelengths. Specifically,the substrate 180 and/or the printed material 190 may be chosen suchthat the interrogation wavelength can reach the taggant 300 in order toinduce a response wavelength. Similarly, the label 150, including thesubstrate 180 and the printed material 190 may be chosen such that theresponse wavelength can penetrate the substrate 180 and the printedmaterial 190 and be detected by the detector. The ability of the label150, including the substrate 180 and the printed material 190, may bereferred to as the transmissivity. A high transmissivity of both theresponse and interrogation wavelengths may be used. In some embodiments,a transmissivity as low as 10% is possible. Choosing the label materialmay mean that a detector with high sensitivity is needed if thetransmissivities are low or a high intensity interrogation signal may beused. These factors may be combined and varied depending on theapplication. The printing or ink used on a label is also chosen basedupon the wavelengths and system requirements.

The substrate 180 can be chosen for its optical properties in regard tothe taggant 300 used or taggants used. If a high transmissivity isneeded at a certain wavelength then the label 150 or substrate 180 maybe matched to that wavelength. Likewise, the taggant 300 may be chosento allow transmission of interrogation and response wavelengthsaccordingly. In this way the transmission and reflectance are used toaccomplish the goal desired.

FIG. 1B depicts an item validation system having more than one taggant.For example, the adhesive 200 comprises a first taggant 310 and a secondtaggant 320. In some embodiments, the first taggant 310 and the secondtaggant 320 are dispersed in the adhesive 200 as desired, to create aresponse wavelength that shows a particular wavelength, an image, abarcode, or other image as described elsewhere herein. As describedelsewhere herein, the first taggant 310 and the second taggant 320 mayhave differing response wavelengths. In some embodiments, the adhesive200 comprises a second adhesive area 210. In some embodiments, thesecond adhesive area 210 comprises a second adhesive or a stronger ordifferent type of adhesive and the second adhesive area 210 comprisesthe second taggant 320. Thus, a desired pattern or image may be createdby the positioning of the second adhesive 210 area having the secondtaggant 320 on the substrate 180 or the object 170. The type of thesecond adhesive may be chosen according to the desired signal or imagegenerated by the response wavelength and/or the type of the secondtaggant 320.

FIG. 1C depicts an embodiment where the adhesive 200 does not comprise ataggant 300. The adhesive areas 210 are adhered to the substrate 180and/or the object 170, and may comprise the taggant 300. In someembodiments, the only portion of the label 150 which comprises thetaggant 300 is the adhesive areas 210. In some embodiments, the adhesiveareas 210 may be disposed only on the substrate 180 of the object 170.The adhesive areas comprising the taggant 300 may be organized oradhered to the substrate 180 to create a desired image, such as abarcode, alphanumeric characters, or any other desired image.

FIG. 1D depicts an embodiment of an item validation system where thetaggant 300 acts as a backlight for a security feature, such as apredetermined image. In some embodiments, the label 150 has varyingoptical properties to impart an image or desired shape or information.To illustrate, the substrate 180 may comprise embedded portions 185. Theembedded portions may comprise a material that is opaque to the responsewavelength of the taggant 300, or that has a different transmissivity ofthe response wavelength of the taggant 300. As the interrogationwavelength is applied form the detector, the embedded portions block allor a portion of the response wavelength generated by the taggant 300,and a resulting image or pattern is displayed. In some embodiments, theembedded portion may extend from the adhesive 200 to the top surface ofthe substrate 180. In some embodiments, the embedded portion 185 may becompletely contained within the substrate. In some embodiments, theembedded portion 185 may be invisible to the naked eye, and onlydetectable when the interrogation wavelength interacts with the taggant300. In some embodiments, the taggant 300 may be applied to thesubstrate or printed material 190 or object alone or mixed with a fluid,gel or the like, which may interact with the adhesive and fix thetaggant in the shape of the desired image or information.

Taggant Integration with Adhesive

The taggant 300 can be mixed or combined with any type of adhesive 200.In some embodiments, the taggant 300 can be uniformly distributedthroughout the adhesive 200. In some embodiments the taggant 300 can beconcentrated in a layer within the adhesive 200. With the taggant in theadhesive, removal of the label from the object will destroy the adhesiveand remove the taggant from association with the label or strata. Insome embodiments in which the adhesive is adhered to a substrate 180,the layer of taggant 300 within the adhesive 200 can be parallel to thesubstrate 180, perpendicular to the substrate 180, or angularly disposedwith respect to the substrate 180. In some embodiments, the taggant 300can be concentrated in portions of the adhesive 200. In someembodiments, these concentrations can be arranged in a non-randommanner. In some embodiments, concentrations of taggant 300 can formimage, a pattern, or any shape or combination of shapes. In someembodiments, the image and/or pattern formed by the concentrations oftaggant 300 can comprise a code such as, for example, a computerreadable code. These computer readable codes can include, for example, abarcode. In some embodiments, the barcode can include, for example, alinear barcode such as a U.P.C. code, a 2D barcode such as, for example,a QR code, or any other barcode. In some embodiments, the concentrationsof taggant 300 can form an image. This image can be any image, and can,in some embodiment, include, for example, a logo, a motto, trademark, adecorative image, an indicator of type or class, and indicator of value,or any other desired image.

A variety of mixing operations can be used to mix the taggant 300 withthe adhesive 200. In some embodiments, the particles can have a singlesize, or can comprise a mixture of particles of a variety of sizes. Insome embodiments, the distribution of taggant particle sizes can be anormal distribution. In other embodiments, the distribution of taggantparticle sizes can be a non-normal distribution. In some embodiments,the taggant particle size distribution can have a median diameter d₅₀ of0.01 μm, 0.1 μm, 1 μm, 2 μn, 5 μm, 10 μm, or any other desired size. Insome embodiments the taggant particle size distribution can have a d₉₀of 0.01 μm, 0.1 μm, 1 μm, 2 μn, 5 μm, 6 μm, 10 μm, 20 μm, or any otherdesired size.

The concentration of taggant 300 found in all or portions of theadhesive layer can vary in different embodiments. In some embodiments,and as discussed above, the concentration of taggant 300 in the adhesive200 can be uniform or non-uniform. In some embodiments, theconcentration of the taggant 300 in regions in which the taggant 300 isintended to be detectable is 2-5% by weight, 1-10% by weight, 1-20% byweight, 1-50% by weight, or any other desired range. In someembodiments, the taggant 300 can be provided to, and added to theadhesives in any desired way. In some embodiments, pure concentrationsof taggant 300 can be added to the adhesives 200. In some embodiments,the taggant 300 can be added to the adhesive 200, suspended in asolution. In some embodiments, the taggant 300 can be supplied in anaqueous suspension at 1% solids, 5% solids, 10% solids, 20% solids, 50%solids, or at any other desired concentration. In some embodiments, theproperties of the adhesive 200, in combination with the properties ofthe particles can create a mixture in which the particles quickly orslowly settle. In some embodiments, the taggant 300 may settle inseconds or minutes, and in other embodiments, the taggant 300 may settlein weeks, months, or years. In some embodiments, the taggant 300 can bemixed into the adhesive in a manner that changes the properties of theadhesive 200, or that does not change the properties of the adhesive. Insome embodiments, the addition of the taggant 300 to the adhesive 200does not degrade the adhesive 200 properties.

In some embodiments, the taggant 300 may be imprinted on the back of thelabel or on a label backing, wherein the adhesive then comes in contactwith the taggant 300. In some embodiments, the taggant 300 may beincorporated into a solution or mixture that bonds to or dissolves intothe adhesive upon contact with the taggant 300. The mixture of thetaggant 300 can simply be the taggant and some adhesive or adhesiveprecursor. In this way the adhesive then has a localized doping of thetaggant 300. This may then impart an image or the like when the taggant300 is interrogated.

The inclusion of the optical taggant into the adhesive provides addedsecurity and increases the ease of use. Adhesives are normally fluid orsemi fluid when first mixed/produced. By adding the taggant 300 duringadhesive preparation stages when the adhesive is fluid the taggant 300is easier to mix with the adhesive. Moreover, with the taggant 300 inthe adhesive 200 instead of in the label 150 or strata or ink thereof,the removal of the label from an article would destroy or impaircounterfeiting by destroying the adhesive. In this way it is moredifficult for counterfeiters to remove a genuine label 150 and place iton another article. The substrate 180 also provides some protection tothe adhesive. Also, when the taggant 300 is only used in a precursor orthe like, as above, the precursor, which is printed on the label orobject, would then slightly mix with the adhesive, but the taggant 300would not migrate throughout the adhesive and would remain only in thearea of the printed precursor.

Corresponding Detector

In some embodiments, the presence of the taggant 300 in the label 150can be determined by a detector. FIG. 2 illustrates one exemplaryembodiment of a detector 400. As depicted in FIG. 2, the detector 400comprises a body 402. In some embodiments, the body 402 can beconfigured to define the exterior of the detector 400. The body 402 canbe further configured to contain all of the components of the detector.In some embodiments, the body can comprise a natural or a manmadematerial, and can comprise, for example, metal, plastic, resin, polymer,composite, or any other material.

The detector 400 can include an illuminator 404. The illuminator 404 cancomprise any feature configured to emit energy with the desiredwavelength. In some embodiments, the illuminator 404 can comprise, forexample, a LED, a laser, a light bulb, or any other desired illuminationsource.

The detector 400 can further include a sensor 406. The sensor 406 can beconfigured to sense luminescence of excited taggant 300. In someembodiments, the sensor 406 can be configured to sense energy of aspecific wavelength, of a specific range of wavelengths, or of anywavelength.

As depicted in FIG. 2, the detector 400 further comprises a firstindicator 408 and a second indicator 410. In some embodiments, theindicators can be configured to provide a user of the detector 400 withinformation relating to the operation, functionality, or any otheraspect of the detector 400. In some embodiments, one or both of thefirst and second indicators 408, 410 can comprise a light, a soundmaking device, or any other feature capable of providing an identifiablesignal to a user. In some embodiments, the first indicator 408 can beconfigured to indicate when the illuminator 404 is emitting energy. Asdiscussed above, the taggant 300 may be configured for excitation bynon-visible light. Accordingly, a user of the detector 400 will not beable to easily determine if the illuminator 404 is emitting energy. Thisinformation can be provided to the user by the operation of the firstindicator 408.

In some embodiments, the second indicator 410 can be configured toindicate when the detector 400 detects the presence of taggant 300 in anobject. In some embodiments, the second indicator 410 can be configuredto indicate the presence of a taggant 300 when the sensor 406 detectsenergy of a required wavelength. As the luminescence may be light in thenon-visible spectrum, such a function of the second indicator 410 allowsa user of the detector 400 to easily determine the presence or absenceof taggant 300 in an object.

As further depicted in FIG. 2, the detector 400 can comprise a controlfeature 412. In some embodiments, the control feature 412 can beconfigured to control the operation of the detector 400. In someembodiments, the control feature can be manipulated by the user. In someembodiments, this manipulation can result in the emission of energy fromthe illuminator 404. In some embodiments, this manipulation of thecontrol feature 412 can result in the operation of the sensor to senseenergy of a desired wavelength.

In some embodiments, a detector can further comprise a processor (notshown) and a memory (not shown) comprising stored instructions. TheProcessor and memory comprising stored instructions can be connected toone or all of the features of the detector 400, and can be configured tosend control signals to one or several of the features of the detector400 and/or to receive information signals from one or several featuresof the detector 400. Thus, in some embodiments, the sensor 406 cancommunicate information relating to sensed energy to the processor, andthe processor can process this information to determine whether thedetected energy indicates the presence of taggant 300 in an object.

A person of skill in the art will recognize that a detector can comprisemore features or fewer features than those outlined above. A person ofskill in the art will additionally recognize that the detector 400 canprovide a user with functionality additional to that described above.

The detector 400 can be configured in a variety of sizes and shapes. Insome embodiments, the detector can comprise a stationary device, amobile device, a handheld device, or a variety of other devices. In someembodiments, the detector 400 can be configured as a handheld device andcan be configured to allow a user to carry the detector 400 and use thedetector as needed to determine the presence of taggant 300 in anobject. The detector 400 can be configured to conduct a simple fieldtest of the authenticity and provide an immediate YES/NO result by, forexample, lighting up an indicator and sounding a beep when the taggant300 is found in a genuine label 150. In some embodiments, IR light fromthe illuminator may pass through portions of the object to excite thetaggant 300, which may allow the detector 400 to detect taggant 300 thatis out of line of sight such as, for example, hidden beneath thesubstrate 180 in adhesive 200.

In some embodiments, the taggant 300 may be able to impart moreinformation than just a YES/NO signal. The layers of the label 150 or ofa label may be altered or made to vary the transmissivity of aninterrogation or response wavelength, or to vary the reflectance of theinterrogation and/or response wavelengths. This may be done by includingadditives to the taggant 300 such as clays, binders, or other additiveswith specific optical properties or by varying the density or surfacecharacteristics of the label Likewise, the optical properties of an inkor imprinted layer on the substrate 180 or in a label may be utilized toabsorb or reflect the response or interrogation wavelengths. The inksmay be chosen as to appear to the human eye as one color but withdifferent properties for the response or interrogation wavelengths. Inthis way the information contained in the ink would be hidden exceptwhen the detector is used to interrogate the label 150. In someembodiments, the ink may be invisible to the human eye. Binders or otheradditives may also be used in the label 150 that would block theinterrogation or response wavelength in order to show an image from thetaggant or the like.

FIG. 3 is a schematic illustration of one embodiment of a securitysystem 100 comprising a detector 400 and a taggant bearing item 511. Asseen in FIG. 3, the detector comprises the body 402 that is configuredto house other components of the detector 400. The body 402 can containa logic module 504. The logic module 504 can comprise a variety offeatures, such as, for example, a processor and memory that can include,for example, stored instructions. In some embodiments, the logic module504 can be configured to communicate with and control other componentsand/or modules of the detector 500. In some embodiments, the logicmodule 504 can provide a control signal to initiate illumination of anobject, and can receive a sensed signal relating to any luminescenceemitted by the object. The logic module 504 can be configured to analyzethe sensed signal to determine whether the sensed signal is indicativeof the presence of taggant 300 in the object.

The logic module 504 can be configured to perform a variety offunctions, such as, for example, analog amplification, analog to digitalconversion, digital to analog conversion, and digital processing. Insome embodiments, the logic module 504 can be configured to controloperation of the detector 500 and communicatingly interact with othercomponents of a system, such as, for example, a delivery system, atransport system, a sorting system, a mail system, or any other desiredsystem.

The logic module 504 can be communicatingly connected with theilluminator 404. As discussed above, the illuminator 404 can beconfigured to generate the interrogation wavelength, which may compriseelectromagnetic energy such as UV, IR, or visible light. The illuminatorcan be an IR generator, a UV generator, a visible light generator, amicrowave generator, or any other generator of energy within theelectromagnetic spectrum which is known in the art. In some embodiments,the illuminator 404 can be configured to generate an interrogationwavelength of a single wavelength, a narrow spectrum of electromagneticenergy, or a broad spectrum of electromagnetic energy. In someembodiments, the illuminator 404 can be configured to generate theelectromagnetic energy in response to one or several control signalsreceived by the illuminator 404 from the logic module 504.

Electromagnetic energy generated by the illuminator 404 can illuminatean object. In one embodiment, and as depicted in FIG. 3, the object cancomprise a taggant bearing item 511, which can comprise, for example, astamp 512 or other type of postage. In some embodiments, the object cancomprise a substrate having an adhesive applied to one or both sides ofthe substrate, and a taggant at least partially interspersed in theadhesive on one or both sides of the substrate.

In some embodiments, electromagnetic energy generated by the illuminator404 can directly pass to the stamp 512, and in some embodiments,electromagnetic energy generated by the illuminator 404 can pass throughan optical feature before it illuminates the stamp 512. In someembodiments, the optical feature can comprise, for example, a filter, alens, a mirror, a prism, or any other light affecting feature. In theembodiment illustrated in FIG. 3, the detector 400 comprises a firstfilter 508. In some embodiments, the first filter 508 can be configuredto allow a broad spectrum of electromagnetic energy to pass through thefirst filter 508, a narrow spectrum of electromagnetic energy to passthrough the first filter 508, all electromagnetic energy above aspecified wavelength to pass through the first filter 508, allelectromagnetic energy below a specified wavelength to pass through thefirst filter 508, or any other desired selection of electromagneticenergy to pass through the first filter 508.

After the electromagnetic energy impinges on the stamp 512, the taggant300 generates a response wavelength, or, in other words, electromagneticenergy is emitted or reflected from the stamp 512 and the surroundingsis sensed by the sensor 406. In some embodiments, electromagnetic energycan directly travel to the sensor 406, and in some embodiments,electromagnetic energy can pass through an optical feature before itreaches the sensor 406. In some embodiments, the optical feature cancomprise, for example, a filter, a lens, a mirror, a prism, or any otherlight affecting feature. As depicted in FIG. 3, the detector 400comprises a second filter 510. In some embodiments, the second filter510 can be configured to allow a broad spectrum of electromagneticenergy to pass through the second filter 510, a narrow spectrum ofelectromagnetic energy to pass through the second filter 510, allelectromagnetic energy above a specified wavelength to pass through thesecond filter 510, all electromagnetic energy below a specifiedwavelength to pass through the second filter 510, or any other desiredselection of electromagnetic energy to pass through the second filter510.

As depicted in FIG. 3, the sensor 406, which is communicatinglyconnected with the logic module 504, can sense electromagnetic energy ofthe response wavelength and can communicate a sensed signal to the logicmodule. The logic module 504 can receive and analyze the sensed signalto determine whether the illuminated object contains taggant 300, andthereby authenticate the illuminated object.

As further depicted in FIG. 3, the logic module 504 can becommunicatingly connected with an indication module 516. In someembodiments, the indication module 516 can comprise a variety offeatures and perform a variety of functions. In some embodiments, theindication module 516 can comprise one or several indicators, that cancomprise features configured to provide an indication of thefunctionality of the detector and the results of the object illuminationto a user or to another system entity, such as, for example, a server, aprocessor, or any other system component. As discussed above, in someembodiments, an indicator can comprise features, such as, for example, alight or a sound making device. In some embodiments, an indicator cancomprise features such as, a display or a monitor, or any other featurecapable of communicating information to a user or other system entity.

As further depicted in FIG. 3, the detector 400 can further comprise acommunications module 518 that can be communicatingly connected to thelogic module 504. In some embodiments, the communications module 518 canbe configured to communicate with other system entities, such as, forexample, a server, a processor, or any other system component. In someembodiments, the communications module 518 can be configured for wiredor wireless communications. In some embodiments, the communicationsmodule 518 can be configured to introduce dynamic changes to a system inthe event that an object is or is not authenticated. In someembodiments, for example, in which a plurality of objects are passedthrough a system for authentication, the communications module 518 canbe configured to communicate information relating to the authenticity ofthe object, which information can be used to segregate the authenticatedobjects from the non-authenticated object.

In some embodiments, the detector 400 can additionally comprise aninterlock (not shown). The interlock can be configured, for example, tohelp prevent the detector 400 from harming its operator or damagingitself by stopping the detector 400 when tripped. A person of skill inthe art will recognize that a variety of different interlocks can beincorporated into the detector 400.

A person of skill in the art will recognize that the detector cancomprise more or fewer features, components, and/or modules than thoseoutlined above. A person of skill in the art will likewise recognizethat the detector discussed above with respect to FIGS. 2 and 3 can beused in a variety of functions and as a stand-alone device, or as anintegral system component.

FIG. 4 is a flow-chart illustrating one embodiment of the authenticationprocess 600 accomplished by the detector. As depicted in FIG. 4, anprocess 600 begins at block 602 and the object is positioned so as to beilluminated by the excitation signal. In some embodiments, theilluminator 404 may have an effective illumination range. In someembodiments this range may be, for example, less than one inch, lessthan three inches, less than six inches, less than one foot, less thanten feet, or any other desired range. In some embodiments, the objectwill be positioned so as to be illuminated by the excitation signal asdepicted in block 602 and the object will be positioned within theeffective illumination range of the illuminator 404.

The process 600 then proceeds to block 604 and the object is illuminatedwith the excitation signal. As discussed above, the illumination of theobject may be controlled by the control feature 412.

After the object is illuminated with the excitation signal in block 604,the process 600 moves to block 606 and receives a signal indicative ofsensed energy. In some embodiments, this signal originates at the sensor406 and is received by the processor or the logic module 504 of thedetector 400.

After the signal indicative of sensed energy is received in block 606,the process moves to decision state 608 and determines if the signalindicates the presence of taggant 300. As discussed above, the taggant300 can be configured to emit energy of a designated frequency inresponse to its illumination and excitation by the excitation signal.Thus, in some embodiments, the detector 400 can be configured todetermine if energy of a designated wavelength is detected. In someembodiments, and as discussed above, the taggant 300 can emit energy forthe duration of the illumination, or for a period of time beyond thetime of illumination. In some embodiments, the detector 400 can use thedecay of emitted energy to authenticate the object.

If the signal does not indicate the presence of taggant 300, then theprocess 600 moves to block 610 and indicates to the user that the objectis not authenticated. If the signal does indicate the presence oftaggant 300, then the process 600 moves to block 612 and indicates tothe user that the object is authenticated.

In some embodiments, the label 150 can be configured and arranged sothat the energy illuminating the taggant 300 must pass through thesubstrate 180 before it is incident upon the taggant 300. Similarly, insome embodiments the energy emitted from the taggant 300 must passthrough the substrate 180 before it can be sensed by the detector 400.Advantageously, many types of thin substrates 180, and even thinsubstrates 180 of other materials, such as wood, allow energy of certainwavelengths to pass. FIG. 5 is a graph illustrating the relativetransparency as a percent of postage stamp paper for energy of certainwavelengths. As seen in FIG. 5, as the wavelength of the energyincreases, the postage stamp paper becomes relatively more transparent.Thus, energy of higher wavelengths can more readily pass through postagestamp paper. Thus, in an embodiment in which the excitation signal mustpass through postage stamp paper before it is incident upon taggantlocated in adhesive found on the back of the postage stamp paper,excitation and emission signals will be better able to pass through thepostage stamp paper as their wavelengths increase.

In some embodiments in which the taggant 300 is located on an item sothat the excitation signal and the emitted signal must pass throughportions of the item before they are incident upon the taggant 300 orthe detector 400 respectively, the relative transparency of portions ofthe object can be determined to determine optimal frequencies of theexcitation signal and of the emitted energy to allow detection of thetaggant 300.

In some embodiments, the relative transparency of a substrate 180 can beused to select an optical pigment to allow the maximum amount of theexcitation signal to pass to the taggant 300 and to allow the maximumamount of the emitted energy to pass to the detector 400. FIG. 6 depictsa chart illustrating the luminescence spectrum of an optical pigmentBL24 in response to excitation by electromagnetic radiation having awavelength of 950 nm. As depicted in FIG. 6, BL24 emits luminescence ina series of narrow spectral peaks, with the largest occurring around 800nm. Due to the combination of the large wavelength for the excitationenergy of BL24 and the large wavelength for the luminescence of BL24that is so stimulated, BL24 is well suited for use with a postage stamppaper having the properties depicted in FIG. 5.

Thus, in some embodiments, the substrate 180, the taggant 300, and thefrequency of the excitation signal of the detector 400 can be selectedto facilitate authentication of an item. Thus, in some embodiments, theproperties of the substrate 180 can be determined, and based on therelative transparency of the substrate 180, a desired range ofexcitation signal wavelengths and emitted luminescence wavelengths canbe selected. In some embodiments, these desired ranges can be used toselect the appropriate taggant 300.

In some embodiments, the taggant 300 can be selected. The taggant 300can be evaluated to determine its optimal excitation wavelengths and itsemitted luminescence wavelengths. Based on this taggant information, thesubstrate can be selected, or the properties of the substrate 180 can bemanipulated to better correspond to the taggant properties.

Use in a Stamp

As discussed above, some embodiments can involve the use of a substrate180 having an adhesive 200 on one or more of the sides of the substrate180. As further discussed above, in some embodiments, the taggant 300can be generally or selectively interspersed through all or portions ofthe adhesive 200. In one embodiment, the substrate 180 can comprise astamp and the adhesive 200 can comprise a stock adhesive. In someembodiments, the stamp can comprise a printed coating that can depict tovalue of the stamp, a decorative image, a logo, or any other desiredimage. In one embodiment in which the taggant 300 is used in one orseveral stamps, or any other object that is exposed to environmentalfactors, the taggant 300 can be resistant to environmental factors andcan be, for example, resistant to the effects of direct or indirectsunlight, to temperature and temperature variations, to humidity, and/orany other environmental factors. Additionally, in some embodiments inwhich the taggant 300 is used in a stamp or other item in which theappearance of the item is important, the taggant 300 have a low loadingin the item, which low loading can prevent changes in the appearance ofthe printed coating.

In some embodiments, and as discussed above, the taggant 300 can beapplied to the adhesive 200, and can thereby be concealed from the humaneye. In some embodiments, the properties of the substrate 180 can beoptimized with properties of the taggant 300 and the electromagneticenergy used by the detector 400 to allow electromagnetic energy to passthrough the substrate 180 to excite the concealed taggant 300.

Further, in some embodiments, the integral manufacture of the adhesive200, including the taggant 300, and the substrate 180 can provide asecurity feature that cannot be removed from the substrate 180 with theintention of re-using the feature. Further, due to the differentdetector configurations, the system 100 provides flexibility inauthentication of postage stamps and other stamp products both in-lineat sort facilities and out in the field through utilizing differentdesigns of the authenticating apparatus.

Other advantages of the system 100 include that fact that thetaggant-impregnated components of the item, such as the stamp, retaintheir design appearance. For example, an inspector can find andauthenticate the product's security feature effortlessly. The life timeof the protection is practically unlimited. The taggant 300 in the stampis not degraded by handling, humidity, storage temperature, or directsunlight. The manufacturing process of the stamp components is not madeany more complex or expensive by adding the taggant 300 to them. Thetaggant 300 also includes a forensic (“court-admissible”) level ofsecurity. The development provides for a single, exclusive, covertsolution that can be applied to different stamps. The solution is quiteinexpensive while, in one embodiment, the detectors may be supplied freeof charge.

Embodiments of the development may also be used in a variety ofapplications, such a stamp, an address label, or other labels. It willbe understood by those of skill in the art that numerous and variousmodifications can be made without departing from the spirit of thedevelopment. Therefore, it should be clearly understood that the formsof the development described herein are illustrative only and are notintended to limit the scope of the development.

Customization

Some embodiments relate to methods of customizing an item. As referredto herein, “customize” and “customized” refer to one or more graphicfeatures received from a requester or items containing such features. Asreferred to herein, “non-customized” and “generic” refer one or moregraphic features applied generally to the class of items such as, forexample, a value indication, class indication, or source indicationapplied to a stamp. In some embodiments, and as discussed above an itemcan comprise printed material 190. In some embodiments, the printedmaterial can include information designating the item or acharacteristic of the item, such as, for example, a class, issuer, orvalue of the item. In some embodiments, the printed material 190 canfurther include a graphic. In some embodiments the graphic can comprisea computer readable code, information such as, for example, a trademark,a message, or a decorative image.

In one specific embodiment, the item can be any desired item. In someembodiments, the item can comprise any dual use item capable of a firstfunction, and a second decorative function, including, for example, apostage stamp, a check, an I.D., and a license plate. FIG. 7 depicts oneembodiment of an label 700. In one embodiment, the label 700 cancomprise a substrate 180, a first information area 704, a secondinformation area 706, and a graphic area 708. In some embodiments, thelabel 700 can comprise additional or fewer information areas 704, 706,and/or graphic areas 708.

In some embodiments, the substrate 180 can comprise a variety ofmaterials and can be configured in a variety of shapes and sizes. Insome embodiments, for example, the substrate 180 can comprise, forexample, sheet metal, paper, plastic, wood, metal, composites, a naturalmaterial, a manmade material, or any other desired material. In someembodiments, the substrate 180 can be configured for functionality inthe environment in which it will be used. Thus, in some embodiments, asubstrate 180 for use as license plate can comprise a material capableof resisting the elements to which a license plate is exposed, such as,for example, galvanized steel sheet metal. Similarly, a substrate 180for use as a postage stamp can comprise paper, or a specific type ofpaper capable of resisting the elements to which a postage stamp isexposed. As mentioned, a substrate 180 can comprise any desired size andshape.

As mentioned, the label 700 can comprise the first information area 704and the second information area 706 and can additionally comprisefurther or fewer information areas. The information areas 704, 706 cancomprise the portion of the label 700 containing an item or informationrelevant to the first function of the label 700. In some embodiments,this item or information can include, for example, an identificationfeature such as an identification number or a computer readable code, aclass indicator, a value indicator, a trademark or logo, a securityfeature, or any other item or information relevant to the first functionof the label 700. In one specific embodiment in which the label 700 is apostage stamp, the first information area 704 can comprise, for example,an indicator of the stamp value, and the second information area 706 cancomprise, for example, an indicator of the stamp class or serviceassociated with the stamp.

The label 700 can comprise the graphic area 708. As discussed above,some embodiments, of the label 700 can comprise additional graphicareas. Further, different embodiments of the label 700 can comprisegraphic areas of different sizes and shapes. In some embodiments, thegraphic area 708 can roughly comprise the size and shape of the label700, and in other embodiments, the size and shape of the graphic are 708can be different than the size and shape of the label 700.

The graphic area 708 can be configured to display a graphic relevant tothe decorative use of the label 700. In some embodiments, the graphiccan comprise any desired graphic, including, text such as, for exampleone or several number, symbols, or letters, a computer readable code, animage, or any other desired graphic.

FIG. 8 is a flow-chart illustrating one embodiment of a process 800 ofmaking the label 700. In some embodiments, the process 800 begins inblock 802 and the item substrate 180 is prepared. In some embodiments,the preparation of the item substrate 180 can comprise any steps toprepare the item substrate 180 for further processing. In someembodiments this step can include, treating the substrate 180, such as,for example, applying an adhesive to the substrate 180, applyingchemicals such as, for example, a chemical primer to the substrate 180,cutting the substrate 180 to the desired size, perforating the substrate180 into easily dividable sections, or any other preparatory step.

After the label substrate 180 is prepared in block 802, the process 800continues to block 804 and performs the primary printing. In someembodiments, the primary printing can comprise adding material to one orboth of the first and second information areas 704, 706 to the substrate180. In some embodiments, this application can comprise printing thematerial on the first and second information areas 704, 706 of thesubstrate 180, or using any other desired method to add desired materialto the first and second information areas 704, 706 of the substrate 180.In some embodiments, this step can comprise adding material to more orfewer information areas found on the substrate 180.

In some embodiments, the information added to the first and secondinformation areas 704, 706 can comprise, for example, item informationrelating to the assigned value of the item, to the type of goods withwhich the item will be associated, to the source of the item, to theclass of goods designated by the item, or to any other desiredinformation. In some embodiments, the information added to the first andsecond information areas 704, 706 can comprise a background pattern ordecorative features. In some embodiments, the information can comprisegeneric, non-customized information.

After the primary printing is performed in block 804, the process 800moves to block 806 to receive image information. In some embodiments,the receipt of image information can comprise the receipt of a hard-copyof an image, pattern, or any other graphic that should be added to thesubstrate 180. In some embodiments, the receipt of image information cancomprise the receipt of a digital or soft-copy of an image, pattern, orany other graphic that should be added to the substrate 180. In someembodiments, the image information can be received via an electroniccommunication, such as via an email, an internet transmission, an SMS, afax, or any other form of electronic communication. In some embodiments,the image information can be received via a personal delivery, via amail delivery, via a courier, or via any other desired delivery ortransport form.

In some embodiments, the received image information can be processed todetermine the acceptability of the received image information. In someembodiments in which the image information comprises digitalinformation, the determination of acceptability of the received imageinformation can comprise evaluating the received information for malwaresuch as, for example, a virus, a cookie, or any other potentiallyharmful software. In some embodiments, the determination of theacceptability of the received image information can relate todetermining the acceptability of the image content, i.e. determiningthat the image information is not pornographic, the acceptability of theimage quality, the acceptability of the image format, or any otherdesired determination.

After the image information has been received in block 806, the process800 moves to block 808 and performs secondary printing. In someembodiments, the secondary printing can comprise adding material to thegraphic area 708 of the substrate 180. In some embodiments, thisapplication can comprise printing the material on the graphic area 708of the substrate 180, or using any other desired method to add desiredmaterial to the graphic area 708 of the substrate 180. In someembodiments, this step can comprise adding material to more or fewergraphic areas found on the substrate 180.

After the secondary printing has been performed in block 808, theprocess 800 terminates at block 810. A person of skill in the art willrecognize that a process 800 of making the label 700 can include some orall of the above discussed steps, as well as steps additional to theabove requested steps. A person of skill in the art will furtherrecognize that process 800 of making the label 700 can include the abovelisted steps performed in any order, including in an order differentthan that shown above.

FIG. 9 is a flow-chart illustrating one embodiment of a process 900 ofperforming the primary printing as is accomplished in the process ofblock 804 of FIG. 8. The process 900 begins at block 902 and receivesthe item substrate. After receiving the item substrate at block 902, theprocess moves to block 904 and applies security measures. The securitymeasures can comprise a variety of features. In some embodiments, thesecurity features can comprise a printed feature, a feature integratedinto the substrate 180, a feature applied to the substrate, or any otherfeature. In some embodiments, the security feature can comprise amicroprint, a watermark, a graphic printed with UV, phosphor, or otherspecial ink. In some embodiments, the security feature can comprise, forexample, a phosphor tag. In some embodiments, the security feature cancomprise a feature integrated into the substrate 180 such as, forexample, threads, a security strip, a tag such as, for example, a RFIDtag, or any other feature. In some embodiments, the security feature cancomprise a feature applied to the substrate 180, such as the taggant 300described above, or any other desired feature.

After the security measures are applied to the substrate 180 asdescribed in block 904, the process 900 moves to block 906 and appliesitem information to the substrate 180. In some embodiments, the iteminformation can comprise information relating to the non-customized itemsuch as, for example, an identification feature such as anidentification number or a computer readable code, a class indicator, avalue indicator, a trademark or logo, a security feature, or any otheritem or information relevant to the first function of the label 700. Inone specific embodiment in which the label 700 is a postage stamp, theitem information can comprise, for example, an indicator of the stampvalue and an indicator of the stamp class or service associated with thestamp.

After the item information is applied to the substrate 180 in block 906,the process 900 moves to block 908 and applies additional print. In someembodiments, the additional print can comprise further non-customizedgraphical information, such as, for example, a background pattern, aborder pattern, a color scheme, or any other generic graphic.

After any additional print is applied in block 908, the process 900terminates at block 910. A person of skill in the art will recognizethat a process 900 of performing the primary printing can include someor all of the above discussed steps, as well as steps additional to theabove requested steps. A person of skill in the art will furtherrecognize that process 900 of performing the primary printing caninclude the above listed steps performed in any order, including in anorder different than that shown above.

FIG. 10 is a flow-chart illustrating one embodiment of a process 1000 ofreceiving the image information and performing the secondary printing,as is performed in the process of blocks 806 and 808 of FIG. 8. Theprocess 1000 begins in block 1002 and receives the prepared itemsubstrate with the primary printing. In some embodiments, the itemsubstrate can be prepared and the primary printing can be performed asdescribed above.

After the process 1000 receives the prepared item substrate with theprimary printing, the process 1000 moves to block 1004 and receives theimage information. As discussed above, the image information can relateto any desired graphic, and can include, for example, text, characters,a computer readable code, a decorative image, or any other graphic. Theimage information can further comprise any desired format. In someembodiments, the image information can comprise a hard-copy of agraphic. In some embodiments this hard-copy can comprise, for example, aphotograph, a drawing, a painting, a sketch, or any other physical copyof a graphic. In some embodiments, the image information can comprise asoft-copy of a graphic, including data comprising, for example, adigital graphic, a digital image, a digital photograph, a digitalpainting, a digital sketch, or any other digitized graphic.

After the process 1000 receives the image information at block 1004, theprocess 1000 moves to decision state 1006 and determines if the graphiccan be used with a personalized item. In some embodiments, thisdetermination comprises determining whether the physical characteristicsof the received graphic information comply with requirements for theimage information. This can include, for example, an evaluation of theimage information to determine if quality, size, and contentrequirements for the image are met. In some embodiments, this caninclude refusing certain content, such as pornographic, crude, orotherwise undesired content. In some embodiments this can includerefusing certain images, including graphics that are too large, toosmall, have too many colors, have too high or too low resolution, orthat fail to meet any other image information criteria.

If the process 1000 determines that the graphic cannot be used with thepersonalized item in block 1006, then the process 1000 moves to block1008 and the process 1000 terminates.

If the process 1000 determines at decision state 1006 that the graphiccan be used with the personalized item, then the process 1000 moves toblock 1010 and the graphic is sized to fit the item. In some embodimentsthis can comprise shrinking or blowing-up the graphic to fit the item.In some embodiments, sizing the graphic to fit the item can compriseadjusting the shape of the graphic by, for example, compressing and/orstretching the graphic in one or several directions. In someembodiments, sizing the graphic to fit the item can comprise adjustingthe shape of the graphic by, for example, truncating or trimmingportions of the graphic.

After the graphic has been sized to fit the item in block 1010, theprocess 1000 moves to block 1012 and applies the graphic to the item.The graphic can be applied to the item using a variety of techniques. Insome embodiments, the graphic can be printed on the item, embossed onthe item, transferred to the item, or applied to the item using anyother desired technique. In some embodiments, the graphic can be appliedserially to a plurality of items, and in some embodiments, the graphiccan be applied simultaneously to a plurality of items. In someembodiments, the graphic can be applied both serially and simultaneouslyto a plurality of items.

After the graphic has been applied to the item in block 1012, theprocess 1000 terminates at block 1014. A person of skill in the art willrecognize that a process 1000 of receiving the image information andperforming the secondary printing can include some or all of the abovediscussed steps, as well as steps additional to the above requestedsteps. A person of skill in the art will further recognize that process1000 of receiving the image information and performing the secondaryprinting can include the above listed steps performed in any order,including in an order different than that shown above.

In some embodiments, the primary and secondary printing can comprisetemporally separated steps, and in some embodiments, the primary andsecondary printing can comprise simultaneously performed steps. In someembodiments, the primary and secondary printings can be performed at thesame location on the same equipment. In some embodiments, the primaryand secondary printings can be performed at different locations and bydifferent equipment. In some embodiments, the item substrates can bepackaged after the primary printing. In some embodiments, the itemsubstrates can be removed from the packaging before the secondaryprinting. In some embodiments, the packaged substrates can be sold to acustomer who can, for example, perform the secondary printing.

The technology is operational with numerous other general purpose orspecial purpose computing system environments or configurations.Examples of well-known computing systems, environments, and/orconfigurations that may be suitable for use with the invention include,but are not limited to, personal computers, server computers, hand-heldor laptop devices, multiprocessor systems, processor-based systems,programmable consumer electronics, network PCs, minicomputers, mainframecomputers, distributed computing environments that include any of theabove systems or devices, and the like.

As used herein, instructions refer to computer-implemented steps forprocessing information in the system. Instructions can be implemented insoftware, firmware or hardware and include any type of programmed stepundertaken by components of the system.

A processor may be any conventional general purpose single- ormulti-chip processor such as a Pentium® processor, a Pentium® Proprocessor, a 8051 processor, a MIPS® processor, a Power PC® processor,or an Alpha® processor. In addition, the processor may be anyconventional special purpose processor such as a digital signalprocessor or a graphics processor. The processor typically hasconventional address lines, conventional data lines, and one or moreconventional control lines.

The system is comprised of various modules as discussed in detail. Ascan be appreciated by one of ordinary skill in the art, each of themodules comprises various sub-routines, procedures, definitionalstatements and macros. Each of the modules are typically separatelycompiled and linked into a single executable program. Therefore, thedescription of each of the modules is used for convenience to describethe functionality of the preferred system. Thus, the processes that areundergone by each of the modules may be arbitrarily redistributed to oneof the other modules, combined together in a single module, or madeavailable in, for example, a shareable dynamic link library.

The system may be used in connection with various operating systems suchas Linux®, UNIX® or Microsoft Windows®.

The system may be written in any conventional programming language suchas C, C++, BASIC, Pascal, or Java, and ran under a conventionaloperating system. C, C++, BASIC, Pascal, Java, and FORTRAN are industrystandard programming languages for which many commercial compilers canbe used to create executable code. The system may also be written usinginterpreted languages such as Perl, Python or Ruby.

Those of skill will further appreciate that the various illustrativelogical blocks, modules, circuits, and algorithm steps described inconnection with the embodiments disclosed herein may be implemented aselectronic hardware, computer software, or combinations of both. Toclearly illustrate this interchangeability of hardware and software,various illustrative components, blocks, modules, circuits, and stepshave been described above generally in terms of their functionality.Whether such functionality is implemented as hardware or softwaredepends upon the particular application and design constraints imposedon the overall system. Skilled artisans may implement the describedfunctionality in varying ways for each particular application, but suchimplementation decisions should not be interpreted as causing adeparture from the scope of the present disclosure.

The various illustrative logical blocks, modules, and circuits describedin connection with the embodiments disclosed herein may be implementedor performed with a general purpose processor, a digital signalprocessor (DSP), an application specific integrated circuit (ASIC), afield programmable gate array (FPGA) or other programmable logic device,discrete gate or transistor logic, discrete hardware components, or anycombination thereof designed to perform the functions described herein.A general purpose processor may be a microprocessor, but in thealternative, the processor may be any conventional processor,controller, microcontroller, or state machine. A processor may also beimplemented as a combination of computing devices, e.g., a combinationof a DSP and a microprocessor, a plurality of microprocessors, one ormore microprocessors in conjunction with a DSP core, or any other suchconfiguration.

In one or more example embodiments, the functions and methods describedmay be implemented in hardware, software, or firmware executed on aprocessor, or any combination thereof. If implemented in software, thefunctions may be stored on or transmitted over as one or moreinstructions or code on a computer-readable medium. Computer-readablemedia include both computer storage media and communication mediaincluding any medium that facilitates transfer of a computer programfrom one place to another. A storage medium may be any available mediathat can be accessed by a computer. By way of example, and notlimitation, such computer-readable media can comprise RAM, ROM, EEPROM,CD-ROM or other optical disk storage, magnetic disk storage or othermagnetic storage devices, or any other medium that can be used to carryor store desired program code in the form of instructions or datastructures and that can be accessed by a computer. Also, any connectionis properly termed a computer-readable medium. For example, if thesoftware is transmitted from a website, server, or other remote sourceusing a coaxial cable, fiber optic cable, twisted pair, digitalsubscriber line (DSL), or wireless technologies such as infrared, radio,and microwave, then the coaxial cable, fiber optic cable, twisted pair,DSL, or wireless technologies such as infrared, radio, and microwave areincluded in the definition of medium. Disk and disc, as used herein,includes compact disc (CD), laser disc, optical disc, digital versatiledisc (DVD), floppy disk and Blu-ray disc where disks usually reproducedata magnetically, while discs reproduce data optically with lasers.Combinations of the above should also be included within the scope ofcomputer-readable media.

The foregoing description details certain embodiments of the systems,devices, and methods disclosed herein. It will be appreciated, however,that no matter how detailed the foregoing appears in text, the systems,devices, and methods can be practiced in many ways. As is also statedabove, it should be noted that the use of particular terminology whendescribing certain features or aspects of the invention should not betaken to imply that the terminology is being re-defined herein to berestricted to including any specific characteristics of the features oraspects of the technology with which that terminology is associated.

It will be appreciated by those skilled in the art that variousmodifications and changes may be made without departing from the scopeof the described technology. Such modifications and changes are intendedto fall within the scope of the embodiments. It will also be appreciatedby those of skill in the art that parts included in one embodiment areinterchangeable with other embodiments; one or more parts from adepicted embodiment can be included with other depicted embodiments inany combination. For example, any of the various components describedherein and/or depicted in the Figures may be combined, interchanged orexcluded from other embodiments.

With respect to the use of substantially any plural and/or singularterms herein, those having skill in the art can translate from theplural to the singular and/or from the singular to the plural as isappropriate to the context and/or application. The varioussingular/plural permutations may be expressly set forth herein for sakeof clarity.

It will be understood by those within the art that, in general, termsused herein are generally intended as “open” terms (e.g., the term“including” should be interpreted as “including but not limited to,” theterm “having” should be interpreted as “having at least,” the term“includes” should be interpreted as “includes but is not limited to,”etc.). It will be further understood by those within the art that if aspecific number of an introduced claim recitation is intended, such anintent will be explicitly recited in the claim, and in the absence ofsuch recitation no such intent is present. For example, as an aid tounderstanding, the following appended claims may contain usage of theintroductory phrases “at least one” and “one or more” to introduce claimrecitations. However, the use of such phrases should not be construed toimply that the introduction of a claim recitation by the indefinitearticles “a” or “an” limits any particular claim containing suchintroduced claim recitation to embodiments containing only one suchrecitation, even when the same claim includes the introductory phrases“one or more” or “at least one” and indefinite articles such as “a” or“an” (e.g., “a” and/or “an” should typically be interpreted to mean “atleast one” or “one or more”); the same holds true for the use ofdefinite articles used to introduce claim recitations. In addition, evenif a specific number of an introduced claim recitation is explicitlyrecited, those skilled in the art will recognize that such recitationshould typically be interpreted to mean at least the recited number(e.g., the bare recitation of “two recitations,” without othermodifiers, typically means at least two recitations, or two or morerecitations). Furthermore, in those instances where a conventionanalogous to “at least one of A, B, and C, etc.” is used, in generalsuch a construction is intended in the sense one having skill in the artwould understand the convention (e.g., “a system having at least one ofA, B, and C” would include but not be limited to systems that have Aalone, B alone, C alone, A and B together, A and C together, B and Ctogether, and/or A, B, and C together, etc.). In those instances where aconvention analogous to “at least one of A, B, or C, etc.” is used, ingeneral such a construction is intended in the sense one having skill inthe art would understand the convention (e.g., “a system having at leastone of A, B, or C” would include but not be limited to systems that haveA alone, B alone, C alone, A and B together, A and C together, B and Ctogether, and/or A, B, and C together, etc.). It will be furtherunderstood by those within the art that virtually any disjunctive wordand/or phrase presenting two or more alternative terms, whether in thedescription, claims, or drawings, should be understood to contemplatethe possibilities of including one of the terms, either of the terms, orboth terms. For example, the phrase “A or B” will be understood toinclude the possibilities of “A” or “B” or “A and B.”

While various aspects and embodiments have been disclosed herein, otheraspects and embodiments will be apparent to those skilled in the art.The various aspects and embodiments disclosed herein are for purposes ofillustration and are not intended to be limiting.

What is claimed is:
 1. A method of making an authenticatable labelcomprising: applying a printing to a first side of a substrate; applyingan adhesive to the second side of the substrate; applying a taggant to afirst side of the backing, wherein the taggant emits luminescence inresponse to illumination by an excitation signal; and attaching thesubstrate to the backing, wherein following attaching the substrate tothe backing, at least a portion of the taggant migrates into theadhesive.
 2. The method of claim 1 wherein the taggant is applied to thefirst side of the backing in a pattern comprising a pre-determinedcomputer readable image which is readable upon excitation of the taggantfrom an excitation signal.
 3. The method of claim 2 wherein the patternis a barcode.
 4. The method of claim 2, wherein the taggant is appliedby printing the taggant onto the first side of the backing.
 5. Themethod of claim 1 wherein applying the taggant to the first side of thebacking comprises applying the taggant with a substance that dissolvesthe taggant into the adhesive during contact with the adhesive.
 6. Themethod of claim 1 further comprising receiving an image from a user, andwherein applying the taggant to the first side of the backing comprisesapplying the taggant in a pattern corresponding to at least a portion ofthe received image.
 7. The method of claim 1 wherein applying a printingto a first side of the substrate comprises applying a printing havingvariable transmissivity to luminescence emitted by the taggant.
 8. Themethod of claim 7 wherein the variable transmissivity of the printingcorresponds to a pre-determined computer readable image upon excitationof the taggant from an excitation signal.
 9. The method of claim 1,wherein the substrate comprises regions of variable transmissivity whichcorrespond to a pre-determined computer readable image which is readableupon excitation of the taggant from an excitation signal.
 10. The methodof claim 1, wherein, when the substrate is removed from the backingfollowing attaching the substrate to the backing, the at least a portionof the taggant which migrates into the adhesive is carried off in theadhesive.
 11. The method of claim 10, wherein the carried off portion ofthe taggant comprise a computer-readable image which is readable uponexcitation by an excitation signal.